| 2020年“1·24”广西大范围冰雹天气过程分析 |
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| 引用本文： | 覃皓,农孟松,赖珍权,翟丽萍.2020年“1·24”广西大范围冰雹天气过程分析[J].气象研究与应用,2021(1):107-112. |
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| 作者姓名： | 覃皓 农孟松 赖珍权 翟丽萍 |
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| 作者单位： | 广西壮族自治区气象台 |
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| 基金项目： | 广西自然科学基金项目(2018GXNSFBA281178);中国气象局预报员专项(CMAYBY2019-084)。 |
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| 摘 要： | 2020年1月24-25日,广西出现近20年来范围最大的一次冰雹天气过程。利用常规观测资料、雷达、卫星以及再分析资料,对此次天气过程进行分析和诊断。结果表明:(1)500hPa宽槽、高空急流、低层切变、地面冷锋以及辐合线相配合提供有利环流背景,异常偏冷的中层导致大温度直减率,大气不稳定增强;(2)深层强垂直风切变、热力不稳定层结以及适宜的0℃、-20℃层高度为冰雹产生提供适宜的热动力条件;(3)对流云团呈“长椭圆”型,具有造成区域性冰雹天气的典型特征,雷达回波图上的回波悬垂结构、超过60dBz的强反射率因子、VIL跃增、持久深厚中气旋以及高层辐散低层辐合等特征,对于冰雹天气的识别和预警具有指示意义。
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| 关 键 词： | 冰雹 不稳定层结 垂直风切变 边界层辐合线 雷达回波特征 |
Analysis of large scale hail weather process in Guangxi on January 24, 2020 |
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| Qin Hao,Nong Mengsong,Lai Zhenquan,Zhai Liping.Analysis of large scale hail weather process in Guangxi on January 24, 2020[J].Journal of Guangxi Meteorology,2021(1):107-112. |
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| Authors: | Qin Hao Nong Mengsong Lai Zhenquan Zhai Liping |
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| Institution: | (Guangxi Meteorological Observatory,Nanning Guangxi 530022) |
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| Abstract: | From January 24 to 25,2020,the largest hail event in recent 20 years occurred in Guangxi.The paper used conventional observation data,radar,satellite and reanalysis data to analyze and diagnose the weather process.The results showed that(1)the combination of 500 hPa wide trough,upper level jet,lower level shear,surface cold front and convergence line provided favorable circulation background,and the abnormally cold middle layer led to large temperature drop rate,enhancing atmospheric instability.(2)Deep strong vertical wind shear,thermal instability stratification and suitable layer height of 0℃and-20℃provided suitable thermal dynamic conditions for hail generation.(3)The convective cloud cluster was a long ellipse type,which had the typical characteristics of regional hail weather.In addition,the characteristics of echo drape structure,strong reflectivity factor over 60 dbz,VIL jump,persistent deep mesocyclone,upper divergence and lower convergence on the radar echo map had indicative significances for hail weather identification and early warning. |
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| Keywords: | hail unstable stratification vertical wind shear boundary layer convergence line radar echo characteristics |
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